mirror of
https://github.com/fairwaves/UHD-Fairwaves.git
synced 2025-11-03 21:43:15 +00:00
92 lines
2.7 KiB
C
92 lines
2.7 KiB
C
/*
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* Copyright 2010-2011 Ettus Research LLC
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "pkt_ctrl.h"
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#include "memory_map.h"
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#include <nonstdio.h>
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//status signals from WB into PR
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#define CPU_STAT_RD_DONE (1 << 0)
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#define CPU_STAT_RD_EROR (1 << 1)
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#define CPU_STAT_RD_IDLE (1 << 2)
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//status signals from PR into WB
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#define CPU_STAT_WR_DONE (1 << 4)
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#define CPU_STAT_WR_EROR (1 << 5)
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#define CPU_STAT_WR_IDLE (1 << 6)
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//control signals from WB into PR
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#define CPU_CTRL_RD_CLEAR (1 << 0)
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#define CPU_CTRL_RD_START (1 << 1)
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//control signals from PR into WB
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#define CPU_CTRL_WR_CLEAR (1 << 2)
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#define CPU_CTRL_WR_START (1 << 3)
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void pkt_ctrl_program_inspector(
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const struct ip_addr *ip_addr, uint16_t data_port
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){
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router_ctrl->ip_addr = ip_addr->addr;
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router_ctrl->data_port = data_port;
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}
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static inline void cpu_stat_wait_for(int bm){
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while((router_status->status & bm) == 0){
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/* NOP */
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}
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}
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void *pkt_ctrl_claim_incoming_buffer(size_t *num_lines){
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uint32_t status = router_status->status;
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//if done: clear the read and return the buffer
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if (status & CPU_STAT_RD_DONE){
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*num_lines = (router_status->status >> 16) & 0xffff;
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return ((uint32_t *) ROUTER_RAM_BASE);
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}
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//if error: drop the packet and start a new read
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if (status & CPU_STAT_RD_EROR){
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putstr("E");
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pkt_ctrl_release_incoming_buffer();
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}
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//otherwise null for nothing ready
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return NULL;
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}
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void pkt_ctrl_release_incoming_buffer(void){
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//clear, wait for idle, and start a new read
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router_ctrl->iface_ctrl = CPU_CTRL_RD_CLEAR;
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cpu_stat_wait_for(CPU_STAT_RD_IDLE);
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router_ctrl->iface_ctrl = CPU_CTRL_RD_START;
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}
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void *pkt_ctrl_claim_outgoing_buffer(void){
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//wait for idle and return the buffer
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cpu_stat_wait_for(CPU_STAT_WR_IDLE);
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return ((uint32_t *) ROUTER_RAM_BASE);
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}
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void pkt_ctrl_commit_outgoing_buffer(size_t num_lines){
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//start a new write with the given length
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router_ctrl->iface_ctrl = ((num_lines & 0xffff) << 16) | CPU_CTRL_WR_START;
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//wait for the write to become done
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cpu_stat_wait_for(CPU_STAT_WR_DONE);
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router_ctrl->iface_ctrl = CPU_CTRL_WR_CLEAR;
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}
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